4345640 has 64 divisors (see below), whose sum is σ = 10780560. Its totient is φ = 1566720.

The previous prime is 4345639. The next prime is 4345651. The reversal of 4345640 is 465434.

4345640 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 8 ways, for example, as 289444 + 4056196 = 538^2 + 2014^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31652 + ... + 31788.

Almost surely, 2^4345640 is an apocalyptic number.

4345640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4345640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5390280).

4345640 is an abundant number, since it is smaller than the sum of its proper divisors (6434920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4345640 is a wasteful number, since it uses less digits than its factorization.

4345640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 4345640 is about 2084.6198694246. The cubic root of 4345640 is about 163.1866330523.

The spelling of 4345640 in words is "four million, three hundred forty-five thousand, six hundred forty".